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Cacomitl Cat — Part 3
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H. Incisors grooved..... GEOMYS, 97-99
HH. Incisors not grooved..... THOMOMYS, 96
GG. Form not mole-like; fore feet normal.
H. Body heavy and thick-set, 12-20 inches long exclusive of tail; legs short.
I. Tail very broad, flat, covered with scales; teeth, i 1/1, c 0/0, p 1/1, m 3/3..... CASTOR, 145-150
II. Tail long and narrow, flattened vertically, and nearly naked teeth, i 1/1, c 0/0, p 0/0, m 3/3. FIBER, 121-127
III. Tail hairy; teeth, i 1/1, c 0/0, p 2/1-1/1 m 3/3.
J. Tail very short, less than the head. APLODONTIA, 150
JJ. Tail moderate, longer than the head, ARCTOMYS, 151-159
HH. Form mouse-like or rat-like; size not larger than a common rat (body less than 10 ins. without tail); teeth usually, i 1/1, c 0/0, p 0/0, m 3/3.
I. Pouches on the sides of the face opening near the mouth.
J. Tail very long; teeth as above. PERODIPUS, 100
JJ. Tail moderate; teeth, i 1/1, c 0/0, p 1/1, m 3/3. PEROGNATHUS, 100
II. No external cheek pouches.
J. Hind legs much longer than the front ones; tail exceeding head and body; teeth in one species, i 1/1, c 0/0, p 1/1, m 3/3....ZAPUS, 102-105
JJ. Hind legs not markedly longer than front ones.
K. Thick-set, short-legged, short-eared mice of the meadow mouse type.
L. Tail less than one-third the length of head and body, generally much less.
M. Upper incisors grooved. SYNAPTOMYS, 107-108
MM. Upper incisors not grooved.
N. Tail so short as to be barely visible beyond the hair.
O. Color mottled (white in winter). DICROSTONYX, 108
OO. Color tawny orange. LEMMUS, 110
NN. Tail plainly visible, usually about one inch long.
O. Molar teeth rooted (See p. 110).
P. Color dark-brown; teeth heavy..PHENACOMYS, 110
PP. Color rusty; teeth lighter. EVOTOMYS, 111-112
OO. Molars not rooted. MICROTUS, 112-120
LL. Tail equal to two-thirds the head and body.
M. Fur coarse; many buff hairs among the brown ones; molars rooted. SIGMODON, 128-129
MM. Fur fine uniform, like that of the Muskrat; molars not rooted. MICROTUS ALLENI, 120
KK. Slender with longer legs and prominent ears and eyes; tail always more than half the head and body (except Onychomys), generally much more.
L. Tubercles on molar teeth in three rows (introduced species)....MUS, 138-145
LL. Tubercles on the molars, if present, in two rows (native species).
M. Size large, rat-like; molars flat on top, divided into triangles. NEOTOMA, 127-128
MM. Size medium, rat-like; molars tuberculate; strongly resembling a young Common Rat. ORYZOMYS, 129-130
MMM. Size small; mouse-like.
N. Tail always more than half the head and body; often about equal.
O. Upper incisors grooved. REITHRODONTOMYS, 130-131
OO. Upper incisors not grooved. PEROMYSCUS, 136
NN. Tail short, less than half the head and body.... ONYCHOMYS, 136
HHH. Form squirrel-like; teeth, i 1/1, c 0/0, p 2/1, m 3/3.
I. An extensible fold of skin on the sides of the body for flying....SCIUROPTERUS, 176-178
II. No extensible skin for flying.
J. Burrowing animals; tail not bushy.
K. Tail very short, 1-3 to 1-4 head and body. CYNOMYS, 160
KK. Tail 1-3 to 1-2 head and body. SPERMOPHILUS, 161-162
KKK. Tail 1-2 head and body; body prominently striped..... TAMIAS, 162
JJ. Arboreal species, tail long and bushy. SCIURUS, 168-176
DD. Tooth row nearly continuous, leaving no large gap at the side of the jaw. Incisors small and always more than two.
E. Size small (less than seven inches long), fur always drab or iron gray, soft and silky; eyes rudimentary.
F. Fore feet flattened for digging (Moles).
G. A fleshy star on the nose; teeth, i 3/3, c 1/1, p 4/4, m 3/3. CONDYLURA, 190
GG. No fleshy star on the nose.
H. Tail naked; teeth, i 3/2, c 1/0, p 3/3, m 3/3....SCALOPS, 188
HH. Tail hairy; teeth, i 3/3, c 1/1, p 4/4, m 3/3. PARASCALOPS, 189
FF. Fore feet normal.
G. Tail short 1-4 the head and body; teeth, i 4/2-3/2, c 1/0, p 2/1, m 3/3..... BLARINA, 180-183
GG. Tail at least 1-2 the head and body; teeth, i 4/2, c 1/0, p 2/1, m 3/3..... SOREX, 184-187
EE. Size medium or large; eyes well developed.
F. Toes webbed.
G. Hind feet large and very different from the front ones, resembling flippers; teeth, i 3/2, c 1/1, p 3/3, m 1/2, LATAX, 223
GG. Feet all alike; teeth, i 3/3, c 1/1, p 4/3, m 1/2..LUTRA, 219-223
FF. Toes not webbed.
G. Toes, five on all feet.
H. Teeth, i 3/3, c 1/1, p 4/4, m 2/2.
I. Nose produced into a slender snout; tail obscurely ringed.....NASUA, 254
II. Nose not lengthened; tail strongly ringed with black and white.
J. Body thick-set; feet plantigrade. PROCYON, 247
JJ. Body slender, weasel-like; feet only partially plantigrade.....BASSARISCUS, 254